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・ Receiving an order to make a diesel engine for both trunks and passenger cars from the army driving school, the high speed metering and water-cooled type diesel engine DA40 was completed and delivered in March 1939.
・ The army driving school compared the engine with other competing engines, and conducted many running, cold area, and alternative fuel tests, etc. before employing the engine as an official engine for 5-liter class army trucks.
・ The Ministry of Commerce and Industry also designated it as an official engine, thus it became the representative mass-produced diesel engine of Japan for both military and private trucks and buses in wartime. Even after the war, it was source of innovation in the transportation sector for a long period. Through increased displacement and repeated improvement, the engine had a product life of almost half a century.
・ It is the origin of Isuzu's diesel engines. |
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| Storage location | : | ISUZU MOTORS LIMITED (3-25-1 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa 210-8524) | |
| Year manufactured | : | 1939 | |
| Manufacturer | : | Tokyo Automobile Industry Co., Ltd. | |
| Classification | : | Literature | |
| Current status | : | In storage: not open to the public | |
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| Model / Manufacture |
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| Model | : | Isuzu DA40 |  |
| Type | : | Diesel | |
| Company name | : | Tokyo Automobile Industry Co., Ltd. | |
| Location | : | None | |
| Installation model | : | Military trucks | |
| Year of manufacture | : | 1939 | |
| Designed by | : | Masao Machida |
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| Specification |
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| Cylinder arrangement, number of cylinders | : | Inline 6-cyilnder | |
| Cycle / cooling method | : | 4-stroke/water-cooled | |
| Valve type / number | : | OHV/2-valve | |
| Combustion method | : | Precombustion chamber type | |
| Combustion chamber | : | Precombustion chamber | |
| Total displacement | : | 5.10 L | |
| Bore x stroke | : | 95×120 mm | |
| Compression ratio | : | 17 | |
| Mass (weight) | : | 510 kg | |
| Injection nozzle | : | Slot nozzle |
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| Performance |
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| Max. power / r.p.m. | : | 62.5 kW (85 ps)/2500 rpm | |
| Max. torque / r.p.m. | : | 260 N･m (26.5 kg･m)/1500 rpm | |
| Rate of fuel consumption | : | 252 g/kWh (185 g/PSh)/1500 rpm |
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| Exhaust emissions measures | : | None | |
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| Device |
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| Supercharger type | : | None | |
| Intercooler | : | None | |
| Variable device | : | None |
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| Points of interest, topicality | : | ・The official military truck engine of the time
･It was used for trucks and buses after the war.
・Improved versions were used until 1982. | |
| Features | : | ・Upright precombustion chamber | |
| Reference materials | : | ・Isuzu Diesel Technology 50 Nenshi, May 1987
・Masao Machida "Jitsuyo Jizeru Kouza", Isuzu Technical Journal Vol. 2, No.3, pp. 21-25, Mar. 1949
・Shigeki Yamaoka, "Nihon No Dizeru Jidosha", Nihon Keizai Hyouryon Sha, 1987 | |
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